public class B {
    public static void main(String args[]) {
      long[] a = {1,2,3,4};
      long[] b = {100,200,300,400,500};
      b = a;
      System.out.println("数组b的长度:"+b.length);  //代码1
      System.out.println("b[0]="+b[0]);
   }
}
